Controlling-apparatus for electrical machinery.



L L. KRIEGER. CONTROLLING APPARATUS FOR ELECTRICAL MACHINERY.

APPLICATION FILED 001 .16, 1907.

Patented Sept 21, 1909.

eennnemsse nerss T tll whom it may emoem:

die it :known that LLoms *Bou-leverd' d'e Velmy, *Oolomoes, "France,engineer," have inve "e'd' s s usefulilrnprovement in Coin e:

rstus for Electrical Mechinery, which im-l "o eielivery eienrrent fromtheinzichine 6i jprovgfngfib i -fifll t 1 m i th "figflgwiirjr for shereaction of the urinespecificetion. eirez'enutheehmiciosses, and ismoreover Thi mvention relates devices 101' eonenti'or e'suegiy' orcurrent when at a Mien;coi' iereiing with the shunt on described, inseries with n eireulhid. so errengedthat for lo t-rolling electricalmachinery it hesper not exceeding the normal retardeiion"tiolhler'resference to eleetrioaiiyflrivenii If them sex: 3 A eriesexcitation, opposed 55 1 '-ialth0ugh.it may b mpioyefi, for L 11- "tothe twosp'reei rig which is in series with fin- 11m elgcfi ica lamachinery eniployeti se Train circuits-nd Whioh during normal other;purposes. ,"of the nieehineis short circuited.

15 1 One of ihe main (lifiiouleiesin eleoariosliyl a this lest-Windingis in circuit, it more "driven vehicles'is met with in the intense fiesthe senies winding coop- 7G =-diate appanetus' (including the switehesi. lg'wiiii theshnnl; winding, and so stops -other.pefcs serving todistribute the-currenibl fine 'snppiy of current from thexgeneraior,

whieh are necesserib interpoieeeel in she e rrent' is therefore cut offwithout breaking -CiICuitS bBiiW8BIl l/h6 electric generetors and .reoireuit,

the motors for oh'iving the vehieles. ifs-.5" The-iwo firee noles ofthemschine concurrents of fairly high voltage and; serength "inentionedere ii-irectly connected to emd' 'osnnot be of large size, they i'requenti iliie motors or ig t-he vehiele, with orwithkslifi'ermuchiamagefrom sparking. ineerposition of e 'switehfor-revers- This invention, which is 'applioshie fie *Jheeurient infihefield niegnets of the 'those systems- 0feleetrioipropulsion which-hifil5. in oriler'eo obviate the necessity of comprise a; compoundwound genemto1',-rensneaking the: qnein'eireuit' by this switch it is161's, it; o ibl t w mh su ly of um-ant, v se-cording to ehis inventionconnected with 'tothe motor or-motors'withoue she neees fil partesta'loiishing end preventing the g'ity' 5f b ki thet'ynain' i it. sshor'z ei-reuih ehis connection being effected 'q11ently wi-tl1outdanger elf-sparking, such a manner that theiswitch can be Acco'rdi'ngtothis inventien the generaop rated-only when no eurrentis flowing 'tOIWhiCh iS eXcite'd-partiy'by e shunt Win-(L in the circuit No sparkingcan therefore 35 ingecross the brushes-and partly bye series ta-liepiece,

winding of like pelerity, is provicied Wi'fili he i-nolors driving thevehiele -may have a second seriesWinding opposed to ehe two fiheir:iieldnisgnets arminged in series or they other windings andorigreeternpower niey he'provideel, besides the series-windings thefirst-series winding; during nornmlwo'rkuhe 'fiekl magnets, with asecond Winding ing this demagnetizing series Winding in pernl-iei fromthe brushes of the-armature short'circuited either upon itself or uponne'nel opposed lo' the series windings, in such controlling -rhe'ostat. va manner-as to obtain a very Variable couple The electric drive employedcomprises with email variations of strength of the curgenera-torhavingen armeture wennchin' the "rene, I v

-usual mannernnd e field inagneoof in fiche iilusnativeiiiogrammaticdrawusual type but provided with the following gsz Figure l is Li-frontelevation of-eppa- 10% "windings: '1. shunt 'exeitet-ion so that rewserrengedin accorriance with this in- 'the maehinecan supply currentunder 75a- "v'enzionx igJ-Q is e sitie elevationwith parts voraloleconditions ate critical speed at least; 'rei'noved showing the sapnratus inn position 50 equalto and usually grenier than thenwonrniilf' efrest. ignS a similar view in the workretariiation of'thernoten-itsWoTking uneier ition. Figs- 4, 5 end 6 are detail lan 10sthe most favorable coniceieions heing assured; views -iiinstneting" difierent positions 0 the withouttakin intoaceount any delivery of?'eensroiliing current from henna-chine --enu therefore; e. rieuoresheggeneretor intl ie-field of which is a shunt coil and. a series coilC. In addition to these-exciting coils, also provide a deniagnetizingseries coil D which is opposed to the coils B and C and of greater powerthan the series coil C. The shunt coil l3 has its ends connected tothebrushes of ,the generator while the coil has one end ductor 15 with thebrush oi the generator" opposite the brush towlnch the exciting" coil Cis connect-ed. The wire or conductorQ runs from the exciting coil C to abrush of the motor E which drives the vehicle and from the oppositebrush of the motor a wire or conductor 3 extends to a terminaloil-contact arranged to make electrical contact with a controller or rev3 switch I. A. similar terminal or contact o connected b a conductor 7to the ii'cld winding 8 of the n'iotor E from which winding a. wire orconductor 9 leads to a terminal or contact 10 similar to the contacts land (3.. ill like contact 12 is connected by wires 13 and to the outerend of tbe dcinaguetizing coil D and the several tern'iinals 4-, (3, 10and l2 are arranged in position to make electrical contact with acontrolling or reversing switch l to close the main circuit. As shown,thisswitch' I is cylindrical in form and is rotatably mounted in asuitable support. Upon the body of the switch are a )hnnlityof coircluctor strips or plates 5, ll, 21 and.22, it being understood, ofcourse, that the body is of.

insulating material. The plates or strips 5 andll are arranged in thesame axial or lougitudinal line on the swilcb. body with their ends outof contact and each one is long enough to engage two of the terminals,as shown in 1 in which figure the plate 5 connects the terminals and (3and the plate 11 connects the terminals 10 and 12. The contact plate 21is so arranged that it will connect the terminals 4 and 10 when theswitch is turned to the proper position while in that same position theplate 22 will connect the terminals (3 and 12, the plate 21,

, clearly shown, being located between the ends of the plate 22 and thebody of the plate 22 being turned out of the direct path between itsends so as to avoid the plate 21.

The switch body is provided with an operating'handle J at its upper endand below the said handle has'an annular flange or collar in the edge ofwhich are three notches 7 y one or which may be gaged by a lockrng'arm Nin order to hold the switch in any position to which it may be turned.-This locking arm N is rigid with a rock shaft R which is mounted 'adjzvcent the switch and is provided with a pedal may be operated.

l sectorshaped circuit-closing arm H is also carried by,the rock shaft Rand the lower curved face of this arm is arranged to ride upon and beconstantly touching the spring Contact fingers G. With the exception ofan ins1ilating strip M at its rear edge, the lower surface of the arm His oil conducting material, so as to make electrical connection with thefingers Grand close a circuit through the same. lhe spring contactfingers G are mounted on the upper ends of terminals 17, 18, from whichwires or conductors l6, 19, respectively, extend, the conductor 16joining with the coi'iductml e to communicate electrically with one endi the demagnetizing coil D, while the conductor 19 passes to a rhcostatF which is connected by a conductor or wire 20 with the wire 15 leadingto the generator.

The pedal K is wronged to operate a governing valve Q of a carburetor,which controls the admission of carbureted air to a engine employed todrive the generator A. This governing valve is open to minimumextent'wl'ien the pedal is o, position of rest, shown in F 2, a springl. attached to themrocl-r, shai tends to maintain the pedal in saiosition. in this position, it will be noticed the fingers G are incontact with the insulating strip M, and, consequently, the circuitthrough said lingers is broken. It will also be observed that when thepedal. inthe ..on of rest the N will progcct above me collar *0 andconsequently, it can not be depressed unless it is directly over one ofthe notche of said collar and: that when said arm ongages one of thenotches rotation "of the switch is prevented.

Supposing the'vehicle to be at rest, the" gas engine is started in theusual manner by means of a starting crank or other device,

an opposite direction to the shunt coil which .produces the magneticfield of the generator.

The switch being turned to the Position shown in Figs. 1 and 5, the maincircuit is closed and is asfollows: Overfiwire 1,

through coilG, over wire to'the armature of motor E; from the motorEover wire 3 to terminal 4-, through strip 5 to terminal'G and over wire7 to the field coil 8. of the motor E and then over Wire 9 to terminal10; through strip 11- to terminal l2-and then over wires13 and 14 todemagnetizing coil D, whence it returns to the 'enei'ator over theWire115. If now, is be esired to start the vehicle, the operator pressesupon The main circuit wiii he r sible because the notch is in positionto receive and ace-o; mode if N;

the pedal swings icarw i, conducting surface oi the circ missing: armis, brought into Contact with the fingers (3: see Fig. 3) and thedemagnetining coil D will be short circnitcd, the current passing asbefore described to the terminal 12 the wire 13, thence passing over thewire to the terminal it", the and arm B, then over the tear incl 18 and19, to a rheostat F, who s it returns to the generator over the E230 and15, As the main circuit has not see. broken, the rheostat F arranged inseries with terminals 17 and 18 permits the deniagnetizing coii to heshunted more or as may be desired. At the start, the rheo at is placedat its minimum resistzmce and the demagnetizing coil is shortcircuited,but the rheostat be moved to its niaxinuun resistance the short circuitwiii a n; i c cah'y suppressed, so that by varying the adgustmcnt of therheostat the speed of the motor 1 e varied,

speed increasing in the direction as the decrease of the resistance therheosta-tx u s a n x a that is to say, in the direction as tne action ofthe demagnetizi winding on the generator A decreases.

To lessen the speed or the prime motor or as en ine. the driver nerrnijs the aerial ti o k'a X, 1 .k ,i I. to swung :orward nnoer tne.u-encoor the spring L, thereby cutting oi fuel. In this way, the may bedecreased withoov the circuits.

of the vesicle y v ariation in Te, the pedai is l of isulat 1 fingers 3,short circuit t the tuil its movement c ing strip into c: and,consequent-i3, inc of the dcmag'gnctizin strength oi. the c r throughsaid coil, provoking ous fall of voltage at generator and, thereforsuppressing the current. The switch may now be tuned to the positionshown in inwhich the arm N may be brought into ngagement with the notchP and all the terminals 4:, 6, 10 and 12 will bear against the nonconducting por tion of the switch so that "ha tend to pass aninstantaneno circuit is closed and the prime motor will rotate under noload.

To accomplish a reverse or backward travel of-the vehicle, the switch isturned to the position sh W n in F 6, bringing the conductor strip 21into contact with the terminals 4 and 10, and the conductor strip 22into contact with the terminals 6 and i2. as hefore, to the strip 21,terminal 10, wire 9, field coil 8 of motor E, wire 7, terminal 6, strip22, terminal '12 and wire 13, whence it will pass to the generatorthrough the demagnetizing coil i) or over the short circuit according tothe position of the pedal, as before described.

iVhiic l have applied my invention more particularly to motor vehicles,it is not confined to such specific use and is applicable to the handcontrol of all electrical generating machinery.

it will be seen that in order to change from a delivery of no currenttov a delivery of the iuaxinuuu current to the electric motors drivingthe vehicle and vice versa to change from the maximum power to zero, itis only necessary to-cut out or to include shunts from the main circuitwithout breaking this circuit and as this operation is effected at twopoints of like polarity without appreciable diti'ereuce of potential the1 short circuiting and putting into circuit takes place without sparkinHaving now particularly described and ascertained the nature of my saidinvention and in what manner the same is to be performed, i declare thatwhat I claim is 1. The combination with a generator havingga shuntwinding and a series winding, of a dcmagi'ietizing winding of greaterpower and OpiJOSGtl to the said series winding, and means for shortcircuiting said demagnetia ing winding.

2. The combination with a generator having a shunt winding and a serieswinding, of a demagnetizing winding opposed to and of greater power thanthe said series winding, and a movable contact adapted to connecttheends or" the deniagnetizing winding to short-circuit the same.

The combination of a generator having a shunt winding and a seriesWinding, a motor in circuit with the generator, a demagnetizing coilopposed to and of greater power than the said series winding inserted inthe circuit with the generator and the motor, and means forshort-circuiting said dernagmetin ing coil.

4. Tie combination with a generator having a shunt winding and a serieswinding, of a demagnetizing winding of greater power and opposed to theseries winding, means for forming a short-circuit around saiddeniagnetizing winding, and a variable resistance in said short-circuit.

5. The combination with a generator haw ing a shunt winding and a serieswinding, of a demagnetizing coil opposed to and of greater power thanthe said series winding, a rheostat, and means for forming a shortcircuit around the dcinagnetizing coil which will include the saidrheostat.

43. The combination with agenerator having a shunt winding and a serieswinding,

armature ofthe 3, 4-,,

greater power than the said series winding, In testimony whereof I havesigned "this a main circuit including the said series Wind- Ispecification in the-presence of tgvo subscrib- 10 ing and thedemagnctizing cofil, a short-sin ing Witnesses. Quit inclufing thedemagm jrng coil, (0nmc't fingers insaid Shari '11 lit, and aQuit-closing arm beazing mmsunfly uyon said fingers and havingcondnctlng my? nonconductinx portions.

LOUIS KRIEGER.

V1 itnesses JEAN VAUGHER, DEAN B. ivhsoN.

